Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a grade com um fabricante yamaha e um tempo de +19.435/retirado?
 ###Tabelas: CREATE TABLE motogp_classification (motogp_classification_id AUTO_INCREMENT PRIMARY KEY, Rider VARCHAR, Manufacturer VARCHAR, Laps VARCHAR, Time/Retired VARCHAR, Grid VARCHAR) CREATE TABLE eliminated_contestants'_weigh_in (eliminated_contestants'_weigh_in_id AUTO_INCREMENT PRIMARY KEY, Contestant VARCHAR, Starting Weight (kg) VARCHAR, Final Weight (kg) VARCHAR, Weight Lost (kg) VARCHAR, Percentage Lost VARCHAR, Position (out of Eliminated Contestants) VARCHAR) CREATE TABLE cantonal_school_systems (cantonal_school_systems_id AUTO_INCREMENT PRIMARY KEY, Canton VARCHAR, Years of Kindergarten INT, Years of Kindergarten provided VARCHAR, Years of Kindergarten legally required VARCHAR, Length of Primary School INT, Length of mandatory Secondary School INT, Separate Secondary Schools? VARCHAR, Cooperative Secondary Schools? VARCHAR, Integrated Secondary Schools? VARCHAR) CREATE TABLE top_8_appearances (top_8_appearances_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Event type VARCHAR, Location VARCHAR, Format VARCHAR, Date VARCHAR, Rank INT) CREATE TABLE grey_district (grey_district_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Years VARCHAR, Area VARCHAR, Authority VARCHAR, Decile VARCHAR, Roll VARCHAR)  
SELECT Grid FROM motogp_classification WHERE Manufacturer = yamaha AND Time/Retired = +19.435